---
kind: "section"
citation: "46 C.F.R. § 56.30-20"
title: "46"
number: "56.30-20"
heading: "Threaded joints."
url: "https://uscodex.org/cfr/46/56.30-20"
---

# §56.30-20. Threaded joints.

- (a) Threaded joints may be used within the limitations specified in [subpart 56.15](/cfr/46/subpart56.15.md) of this chapter and within other limitations specified in this section.
- (b) (Modifies 114.1.) All threads on piping components must be taper pipe threads in accordance with the applicable standard listed in table 2 to [§ 56.60-1](/cfr/46/56.60-1.md). Threads other than taper pipe threads may be used for piping components where tightness of the joint depends on a seal weld or a seating surface other than the threads, and where experience or test has demonstrated that such threads are suitable.
- (c) Threaded joints may not be used where severe erosion, crevice corrosion, shock, or vibration is expected to occur; or at temperatures over 925 °F. Size limitations are given in table 1 to [§ 56.30-20(c)](#c).
- (d) No pipe with a wall thickness less than that of standard weight of ASME B36.10M (incorporated by reference; see [§ 56.01-2](/cfr/46/56.01-2.md)) steel pipe may be threaded. For restrictions on the use of pipe in steam service more than 250 psig or water service over 100 psig and 200 °F (93.3 °C), see part 104.1.2(c)(1) of ASME B31.1 (incorporated by reference; see [§ 56.01-2](/cfr/46/56.01-2.md)).

## Notes

### Amendments

[CGFR 68-82, 33 FR 18843, Dec. 18, 1968, as amended by CGFR 69-127, 35 FR 9978, June 17, 1970; CGD 73-254, 40 FR 40164, Sept. 2, 1975; CGD 77-140, 54 FR 40606, Oct. 2, 1989; USCG-2003-16630, 73 FR 65178, Oct. 31, 2008]

### Source

Source: CGFR 68-82, 33 FR 18843, Dec. 18, 1968, as amended by USCG-2020-0634, 89 FR 50131, June 12, 2024, unless otherwise noted.

### Authority

Authority: 33 U.S.C. 1321(j), 1509; 43 U.S.C. 1333; 46 U.S.C. 3306, 3703; E.O. 12234, 45 FR 58801, 3 CFR, 1980 Comp., p. 277; E.O. 12777, 56 FR 54757, 3 CFR, 1991 Comp., p. 351; DHS Delegation No. 00170.1, Revision No. 01.4.

### Source

Source: CGFR 68-82, 33 FR 18843, Dec. 18, 1968, unless otherwise noted.

### Amendments

[CGFR 68-82, 33 FR 18843, Dec. 18, 1968, as amended by CGFR 69-127, 35 FR 9978, June 17, 1970; CGD 73-254, 40 FR 40164, Sept. 2, 1975; CGD 77-140, 54 FR 40606, Oct. 2, 1989; USCG-2003-16630, 73 FR 65178, Oct. 31, 2008]